Return the color utility to blue-yellow
Return the color utility to blue-yellow

This should be temporary. Instead we should have the default colors
be the blue-yellow scheme and the management dashboard should override
those with the grays it uses, instead of having two separate color
utilities

https://seedscientific.atlassian.net/browse/POLIO-850

unicef/polio,SeedScientific/polio,unicef/rhizome,SeedScientific/polio,unicef/rhizome,SeedScientific/polio,SeedScientific/polio,unicef/polio,unicef/rhizome,SeedScientific/polio,unicef/polio,unicef/polio,unicef/rhizome